This is the story of Yuuya Toba, a somewhat diligent heir to a prestigious family, and Mitsuki Fushimi, a girl who appears to be an elegant and untouchable goddess, but is actually an easy-going and fun-loving person.

The two are childhood friends, having semi-lived together since starting high school, and are so close that those around them often refer to them as a married couple. Yet, despite their deep sense of familiarity, they become too embarrassed to even hold hands the moment they begin thinking about romance!

““Being more than married but less that lovers—it just doesn't feel right!””

Motivated by this feeling, the two set out on a journey to gain experiences that make them feel more like a proper couple.

Thus the story of a naive and silly pair as their relationship moves to the “next” level.